F i fig



y 1931. H. ROSENBERG 6,503

APPARATUS FOR TREATING METAL WORK Filed July 25, 1929 2 Sheets-Sheet 1 FIG. 1.

HEYMAN Enamel-:55,

May 19, 1931. H. ROSENBERG APPARATUS FOR TREATING M ETAL WORK Y Filed July 25, 1929 2 SheetsSheet 2 FIB.E..

HEYMAN RDEENBER/E,

Patented Ma y 1 93 1 UNITED. STATES ROSENBERG,

OF NEW YORK, N. Y.

APPARATUS FOR '1RIlilAIll'IIN'G METAL Application filed July 23, 192 9. Serial K0. 380,350.

This invention-relates to improvements in apparatusrfo'r case-hardening, and has as its essential obj ectthe advancing of the improvements incorporated as the subject matter of my copending applicationfiled June-20th, 1929, patented December 39, 1930, No. 1,786,508. v o 1 4 A more detailed object is the conservation of values and increase in efficiency following the utilization of waste heat from the cyanide or other salts furnace for preheating the work to be hardened: V I

A further object is the delivery of preheat ed work to the molten salts without affording oppokrtunity for coolingv of chilling of the wor t A still further object is the delivery of work to the molten salts with opportunity for escape of fumes reduced substantially to .a negative. i

A still further object is reduction of labor and increase of ease and facilitywith which worki may be handled as wellas increase in s cc 2 With these and further objects. in view as will in part hereinafter become apparent and in part be stated, the invention comprises certain constructions, combinations, and arparts as subsequently specified v rangements of and claimed."

in the accompanying drawings 7 Figure 1 is a front elevation of an apparatusembodying the features of the present invention; o a

Figure 2 is a side elevation of the same,

parts being broken awayand arts seen in section, and other parts being broken away for the saving of space. v

' Figure 3 is atop plan viewof the work R preheating attachments, paws of the furnace being broken away for the savin ofspace.

r In my above-identified co pend ing applica tion, there is disclosed a plant for hardening 415 handling of work after it has been placed in of work by the' cyaniding or other salts process involving 4 apparatus for facilitating the container to be submerged in the-molten salts," provision being made for removal of; worktherefrom for quenching the work and for removal 'ofithe work'from. the quench without exhaustion of fumes into the atmos-' phere about the plant.

The resent invention relates to attachments or such a plant to facilitate the preheating of'work or carbonizing thereof at a point so juxtaposed with respect to the salt: vat asto utilize waste heat from the furnace for said vat and to enable ready discharge of preheated work without chilling or reduction of the temperature of such work from the time of leaving the point of heating to the time of entering the molten salts;

Repetition of structural details and operations fully set forth in my aboveeidentified co-pending application will be as largely avoided as practicable while rendering clear the present improvements.

Referring to the, drawings by numerals, 1 indicates the furnae for the cyanide or other, salts vat 2. The furnace 1 maybe heated; with fuel of any desired char'acter, such, for example, as gassupplied through pipe 3 and burners L Mounted on the furnace 1 is a housing orrhood 5 having a vestibule housing 6 extending to. enclose the area above. the quenchingvat, not illustrated,but' shown in detail in my said co-pending application. A rock shaft 7 is j ournaled in a frame of furnace. 1 and carries a'crankarm 8 to whichis fixed and from which suspends the work container 9, which isa reticulated metal basket adapted to .contain smali particles-of work, such as screwsand nails, while admittin free entry an drainage .of molten salts. The free end of the arm 8 is adapted to swing through an are indicated. by .dot and dash line 10 inFigure2 to and from a position over the quenching vat, not illustrated, after the manner set v forth in detail in my said copendin'g appli- I a r V v cation. A The hood 5 is preferably provided with a door 11 having a eat-resisting, transparent plate 12 which may be pyrex, mica, or other I acceptable heat-resisting v substance. The door 11 is-maintained closed under all nor-1 mal conditions during operation, but affords access to the interiorwhen 'theiurnace is shut down and repairs are required, or other.

occasion for interiorwork arises: 7 All of-the structural features thus far described aredisclosed and covered in my said co-pending application, and are here referred'to to render clear their relation to the novel parts and their proper combination therewith.

'Furnaces, such as furnace 1, arecustoma- 5 rily provided with a flue or exhaust, pipe 13 through which under ordinary workin conditions flames and other hot products 0 combustion constantly exhaust. The flue 13 frequently exhausts into the atmosphere as a negliglble factor, or, in some instances, is connected with a flue leading above the roof of the building in which the plant is located. Thus, whatever heat is exhausted through flue 13 is ordinarily wasted. The present invention includes apparatus for utilizing such exhaust heat by providing a special tube or flue 14 fitting upon and receivin' the exhaust from flue 13. The upper endo flue 14 communicates throughan opening 15 in the cover plate 16 of furnace 1. The flue 14 is also provided with a branch exhaust pipe 17 leading generally laterally from flue 14 at or near the upper end thereof. A. shaft 18 is journaled in the upper end portion of flue 14 at the place of jointure of the upper portion of branch 17, and a flat-plate gate or dam er 19 is fixed to and carried by shaft 18, so t at, when the shaft is oscillated, the plate may be moved 3 from a pendent position, seen-in full lines in Figure 2, where it closes the branch 17 to a horizontal osition seen in dotted lines in Fi ure 2 w ere it closes opening 15. Shaft 18 is preferably provided with an appropriate operating handle 20 having a weight 21 at,

its outer extremity to counterbalance and retain the dam er 19 in either of it's positions, the handle 20 eing fixed to shaft 18 at such an angle as to pass the vertical position in moving to either of the two positions of the damper 19.

Arranged above the furnace plate 16in line with opening 15 is .a metallic container or basket 22 adapted to contain work to receive the heat rising through the o ening 15. The

basket or container 22 is carried by andpref- I erably. formed integral with a vertically up- ,standing plate 23 WhlCh 1s shown as rectangular but which maybe otherwise shaped as desired. The rectangular shape tends toward convenience of construction. The-hood 5 is formed with a doorway 24 surrounded by an angle bar 25 fixed to the hood 5 and the plate 23 is proportioned to snugly fit withinand readily pass through the doorway 24. Thus, when the plate 23 is in its normal or upright position, it serves to close the doorway 24 and thus keep the hood 5 sealed. Thepla'te 23 is preferably provided with upwardly converging, laterally outstanding flanges 26, 26, leading from the upper edge of basket 22 'substantially to the upper terminus of plate 23. The convergence of-flanges 26 serves to cause said anges to function as a guiding funnel durin as some of the operations to be described.

2 tion, as shown in dotted lines in F i ure 2. An appropriate stop lug 33 is carrie by basket innermost position;

shaft 27 is journaled in the frame 25 and fixed to the inner face of plate 23, so that, when the shaft 27 ,is oscillated, the late will be swung with and about the sha as an axis. To one end portion of shaft 27 is'fixed a laterall y outstanding arm 28 carrying a counterbalan'cing weight 29. Arm 28 is adjustably secured by set screw 30 to shaft 27, and weight 29 is adjustably secured by set screw 31 to shaft 28. Weight 29 is located to counterbalance the weight of the outstandin por tions of basket 22 and of the work in the asket so as to normally maintain the parts balanced with the plate 23 in an upright position. Counterbalancing weight 29 also serves to reduce the effort required to swing basket 22 when loaded. An operating handle 32 is fixed to the shaft 27 at the opposite end portion from the location of weight 29, handle 32 being preferably located at What is usually considered the front of the furnace, that 1s, the side'having the door 11, so as to be most readily accessible to the operator.

It is to be observed'that the plate 23 is proportioned in length, and the shaft 27 properly located to cause the upper end of the plate to lie immediately above the receptacle 9 near one edge portion thereof when the plate 23 is swung to its innermost posi- 22 and may be cast integral therewith, or otherwise fixed to the basket, and is located to contact with the outstanding flange of angle frame 25, as clearly seen in dotted lines in Figure 2 when the plate 23 is swung to its Lug or detent 33 thus stops inward movement in time to prevent actual contact of plate 23with container 9.

- The operation should be fairly obvious, and 1 may be briefly stated as follows: The furnace being in operation, the operator deposits a charge of work in basket 22 and swings the lever 20 to the full line position of Figure 2 if it is not already in that position. The parts are left in this condition, so far as basket 22 and itsas'sociated parts are concerned, but if the plant has been previously in operation, the treatment of the work in container 9 will continue and the batch of work will be discharged into the quench after the man- 'ner fully set forth in my above-identified copending application, and container 9 swung back into the Vat 2. By this time the preheatins, operation of the work in the basket: 22 1 0 will have sufliciently progressed and the operator will swing the handles or lever 32 for rocking shaft 27 to swing plate 23 from the upright position to the dotted line position of Figure 2. Asthe parts reach this position, the charge of work in basket 22 will slide down the plate 23, being concentrated by the guiding flanges 26, and discharge from the now lowered end of plate 23 into the container 9, and as soon as the discharge occurs, the 0 I o erator will reverse the movement of shaft 2 and'thereby restore the basket 22 to its former position, whereupon another charge of work may be introduced. It is possible that some of the operations in the case-hardening process may delay the emptying of the container 9 by the time the treatment of the work in basket 22 has been completed, and when that occurs, over-heating is prevented tion of Figure 2, and thereby exhausting the heat from flue 13 through branch 17 The closing (and opening of the branch 17 will be a matter for the discretion of the operator as required, according to the progress of the treatment of the'work in hand.

It is understood, of course, that the container 9 is never left in the vat 2 when the furnace is shut down, and is, therefore, never present in the vat when the salts are solidi} fied, the container 9 being lowered into the vat at any beginning of operations only after the. salts in the vat have acquired a molten state. As the container 9 is not inposition to receive a supplyof work from basket 22, except when container 9'is in vat 2, no discharge of work from basket 22 occurs except when the furnace parts are conditioned for progress ing with the hardenin operation.

It is, of course, well common practice is to preheat the workin a cylinder or likecontainer subjected to the heat of an appropriate independent furnace, and when the requisite temperature has been attained, it is then common practice to conveythe work and deliver it to the work con-- tainer in the salts vat, or to such container before introduction into the vat, but with such' nace and a container for salt located to be heated thereby, of a movabl mounted container for work located in t e path of disnace, the container being adapted to bemoved from the heating position to a discharging position 'fordirecting the ;work from .the container into the salt.

on, 2. In apparatus for molten salts hardeningof-metal work, thecombination, with.afurnace and a container for'salt located to be.

heated thereby, of apivotallymounted container for work located to be heated by the 05 same furnace, and means for'swinging the by swinging lever 20 to the dotted line posi I wn-to those skilled in the artof hardening metal work that the charge of heated products from thesame furv container from the heating positionto a discharging position for directing the work 7 4 4. In apparatus for, molten salts hardening of metal work, the'combination, with a furnace and a container for salt located to be heated thereby, of a container for work located adjacent the salt container in position to be heated by said furnace, a pivotal mount- .ing for said work container located to enable tilting of the workcontainer to a position discharging into the salt container, and a chute extending from said work container for pro viding a path'for the work from the work container to the 'salt container when the work container is tiltedto the discharging posi- 1 tion.

5. In apparatus for molten salts hardening of metal work, the combination, with a furnace and a container for salt located to be heated thereby, of a container for work located adjacent the salt container in position to be heated by said furnace, a pivotal mounting for said work container located to enable tilting of the work container to a position discharging into the salt container, and a hood for the salt containerfor confining'the being formed with, an opening for enabling the discharge of work into the salt container.

6. In apparatus for molten salts harden,- ing of metal work, the combination, with a furnace anda container for s'alt'located to be heated thereby, of a container-for work located adj acent the-salt container-in osition to be heated'by said furnace, a-pivota mountingfor said work container located to enable tilting of the work container to aposition' discharging into the salt container,a hood for the salt container for confining thefumes thereof, the work contaiher being pivoted at fumes thereof, the work container being pivoted at the exterior of the hood, and the hood lit the exterior of the hood, and the hood being"- formed with an openin'gfor enabling the dis charge of work into the salt container, and

means carried by the workcontainer for closing the opening in the hood when the, work container is not in a discharging position.

7. In apparatus for molten salts hardening of metal work, the combination, with a furnace and a container for salt located tobe heated thereby, of a container for work lo.-

cated adjacent the salt container in position to beheated by saidfurnace, a pivotal mounting for said work container located to enable tilting of the work container to a position discharging into the salt container, a hood for the salt container for confining the fumes thereof, the work container being pivoted at the exterior of the hood, and the hood being formed with an opening for enabling the discharge of work into the salt container, and means carried b the work container for closing the opening in the hood when the work container isnot in a discharging position, the said closing means being located and proportioned to provide a path for discharging work from the work container to the salt container.

In testimony whereof I affix my signature.

- HEYMAN ROSENBERG. 

